(E) Decision of hearing officer.--

(i) In general.--Subject to clause (ii), a decision made by a hearing officer shall be made on substantive grounds based on a determination of whether the child received a free appropriate public education.

(ii) Procedural issues.--In matters alleging a procedural violation, a hearing officer may find that a child did not receive a free appropriate public education only if the procedural inadequacies--

(I) impeded the child's right to a free appropriate public education;

(II) significantly impeded the parents' opportunity to participate in the decisionmaking process regarding the provision of a free appropriate public education to the parents' child; or

(III) caused a deprivation of educational benefits.

(iii) Rule of construction.--Nothing in this subparagraph shall be construed to preclude a hearing officer from ordering a local educational agency to comply with procedural requirements under this section.